I have had a Blue 8x Revision number 0002 for about 3 weeks and no marking scuffing or peeling.

Do we think we nailed the reason for the discoloration down to clothing dye?

Well I i only wear jeans and navy tough scrub tops and bottoms and am a heavy user (over 9GB of data and 950 messages in one month with alot of Facebook, mail, and message checks per hour. Probably about, in and outie of pocket 2 times per 10 mins) and no discoloration at all.

Surprised we haven't see and revision 0003 from any carrier but Tmobile (I Think!) hmm, and the people with Revision 0002, how often do you use your phone? I use my phone a lot (in and out of pocket every 5 minutes AT LEAST) so maybe the 0002 Revision with no black corners is due to light usage!